Want this question answered?
There are two.
There are two.
There are two.
There is only the speed sensor and the range switch.
Your Villager has only one O2 sensor located on the front catalytic pipe before the converter. You should be able to look down between the engine and radiator and see it.
Four
4
4
FOUR
There are a total of ( 4 oxygen sensors ) according to the engine wiring schematic for the 1997 Mercury Mountaineer in my Haynes repair manual ( 2 oxygen sensors are " upstream " sensors used by the PCM to adjust the air / fuel ratio of the engine ) ( 2 oxygen sensors are " downstream " sensors / catalyst monitors )
There is only one, in the engine "v" under the intake manifolds and coolant crossover tube.
There are two.